File



1 I M. M. SAUERS 2,816,351

FILE Filed April :5, 1956 FIG. I.

FIG. 2.

I? Ill/4%, 22

INVENTOR MYRL M. SA UERS 2,816,351 Pleate :.Pe=: .1 1.. .9

Myi'l M. Sauers, Compton, Calif. Application Apri 3, 1956, SerialNo.575,886 i lClaim. c|.z9-- -7s 4 Thisinveution relates to files. I I 1 Itis an object of the present invention to provide a novel file which isadapted to smooth and round the c'drriersjof-many and varied'articles,parts and pieces, and which may be used on a large variety of substancesand materials, for example lumber, plastics, aluminum, brass and mildsteel.

It is another object of the present invention to provide a file of theabove type which is adapted for either push or pull operation, dependingon the requirements of the job at hand.

Other objects of the invention are to provide a file bearing the aboveobjects in mind which is of simple construction, has a minimum number ofparts, is inexpensive to manufacture and eflicient in operation.

For other objects and for a better understanding of the invention,reference may be had to the following detailed description taken inconnection with the accompanying drawing, in which:

Figure 1 is a side elevational view of a preferred embodiment of thepresent invention;

Fig. 2 is a transverse sectional view thereof taken along the line 2-2of Fig. 1;

Fig. 3 is a longitudinal sectional view taken along the line 33 of Fig.l; and

Fig. 4 is a view similar to Fig. 3 of a modified form of the presentinvention.

Referring now more in detail to the drawing, represents a shank memberto which is secured a wooden handle 11 by means of collar 12, the end ofthe handle 10 remote from handle 11 being integrally formed with thebent shank 13, substantially as illustrated. The shank 13 terminates inthe externally threaded portion 14 and has screwed thereon the lock nut15.

A filing member 16 of elliptical cross section (Fig. 2) is provided withthe otfcenter longitudinal bore 17 which extends through the filingmember and terminates at each end in the internally threaded portions 18and 19. The internally threaded portions 18 and 19 are adapted toselectively receive therewithin the externally threaded portion 14 ofthe shank 13 whereby to reverse the dip rection of the filing head, aswill be obvious.

As shown in Fig. 2, the filing member 16 at the side thereof remote fromthe bore 17 is provided with a longitudinal groove 20. Longitudinallyspaced teeth 21 are formed by cutting slots 22 transversely inlongitudinally spaced relationship to each other through and below thegroove 20. Then each groove section is cut or ground at about a twodegree angle with the axis of the tool. While the teeth 21 may beunequally spaced, the deviation is slight. The cross slots 22 may be cutone degree or two degrees from a plane at right angles to thelongitudinal axis of the filing member 16.

The longitudinal bore 17 through the filing member facilitates theremoval of any foreign matter or chips that may lodge in the threadedareas 18 and 19.

The flaps 23 (Fig. 2) on each side of the file member 16 adjacent theteeth 21 facilitate chip elimination and also facilitate the observanceofthe operationby 'the operator when material is being removed.

The cross slots 22 may becu't'with a circular cutter; although testshave shown that a flat 'bottomslotr mains open longer and is easier toopen in the event of plugging. By reason of the internallythreadedportions 18 and 19 at opposite ends of the filing member 16, thelatter may be effectively mounted on the shank 13 for either pulling orpushing over the corners of the work piece. It can alsobe used on workin a vise or me lathe chuck as well as on parts held in the hand. Thedesign of this file makes it practically non-clogging", anditiseas'y' toclean and can'be resharpeued. v

It will be apparent that the-cross slots 22 bet'wee the cutting edgesare deep enough to accommodate thechips and permit them to escape. Theforms of the cutting edges are such, it will be-noted, that-a neat,round corner can be accomplished, even by an unskilled worker.

After the filing head 16 is positioned on the shank 13, it is quicklylocked in place by turning the nut 15 tightly thereagainst. Thus, thefile head may be secured to the shank 13 with its teeth headed in eitherdirection, making it adaptable for either push or pull operation.

Rough, sharp and jagged corners can be smoothed and rounded withcomparative ease and safety with the invention due to the fact that thefile tends to stay on the work and does not slip otf, as is the tendencywith other filing types. As the filing area of the tool is preshaped, aneat, smooth, round corner can be produced with comparative ease quicklyand safely, even by a novice. For delicate Work, the file head may beremoved from the shank and held between the thumb and fingers whereby tofacilitate lighter and more concentrated control.

In construction, the cutting edges or teeth 21 may be cut or ground withany desired back clearance, so that the bite or depth of cut can becontrolled.

As shown in Fig. 4, the teeth 21a can be unequally spaced by providingthe unequally spaced cross slots 22a whereby chatter or wavy cuttingaction may be avoided.

In other respects the form of the invention shown in Fig. 4 is the sameas that shown in Figs. 1 through 3, and like reference numerals identifylike parts throughout the several views.

The invention may be resharpened after becoming dull from prolonged use,thus making it as good as new.

The cross slots 22 between the cutting edges or teeth 21 are deep enoughand wide enough to accommodate the chips and permit them to escapewhereby to minimize clogging or loading. The slots 22 may be easilycleaned out, as will be obvious.

The forward tooth 21a (Fig. 3) is slightly thicker than the rest of theteeth partly because it is adapted to absorb the brunt of the work andalso so that it may be end ground without appreciably weakening it.

The file head 16 is formed of tool steel and hardened. It is left deadhard as tempering is unnecessary.

The slots 22 could be cut at an angle cross the head 16, which might bean advantage for certain types of work, although it would mean anincreased manufacturing cost. Also, the file head 16 could be formedwith half the teeth 21 heading in one direction and half in the other sothat push or pull operation could be accomplished with one setting ofthe head 16 on the shank 13. The file may be made of a variety of sizesor of one size which appears to be sufiicient for most work. Using thesame general design, but with modifications, this file can be made towork well on internal, corners, such as the edge of the bore on a workpiece on a lathe.

While various changes may be made in the detail construction, it shouldbe understood that such changes shall be within the spirit and scope ofthe present invention as defined by the appended claim.

What I claim as new and desire to protect by Letters Patent of theUnited States is:

A file comprising, in combination, handle means including an elongatedexternally threaded shank having a handle connected to one end thereof,said handle being concentric with said one end of said shank, theopposite end of said shank defining an obtuse angle with said one end ofsaid shank so as to provide finger clearance for said handle, a filehead member, means for eccentrically mounting said file head member onsaid opposite end of said handle, said file head member at one sidehaving a curved outer surface with a longitudinally extending grooveextending from end to end thereof, said file head member having anoffset bore extending therethrougi from end to end at the side thereofremote from said groove, each end of said bore being internally threadedfor threaded engagement with the opposite end of said shank, thelongitudinal axis of said file head member being parallel to thelongitudinal axis of said opposite Li-i 4 end of said shank, a pluralityof laterally extending and longitudinally spaced apart slots at diverseintervals extending through and below said groove to define a plurealityof longitudinally spaced teeth of varying size, the frontmost of saidteeth being slightly thicker than the remaining teeth to facilitate useand sharpening of the tool.

References Cited in the file of this patent UNITED STATES PATENTS291,460 Yeatman Jan. 1, 1884 545,739 Shaw Sept. 3, 1895 570,511 ShawNov. 3, 1896 991,566 Vernaz May 9, 1911 1,096,496 Dysko May 12, 19142,083,123 Quick June 8, 1937 2,278,737 Praeg Apr. 7, 1942 2,312,929Phaneuf Mar. 2, 1943 FOREIGN PATENTS 320,138 Great Britain Oct. 10,1-929

